As a general rule, if a spell caster is observing the world through their familiar, do they lose their skill proficiencies or are they supplemented by the familiar?
As a specific example:
I have a Warlock, Pact of the Chain, and have an imp for my familiar. The character has the proficiency of "Deception". But the imp grants me "Insight" and "Persuasion".
My plan was to have the imp sit invisibly on my shoulder so even though I am using its eyes and ears, it is still close enough that I could hold a conversation (Think of it like listening to a translator over headphones).
If I'm in imp vision mode, can I still gain the benefit of its "Insight" skill along with my personal "Deception" skill?
Most situations I've read about assume the caster is sitting still or being guided by an ally while the familiar is far away. But couldn't the character learn to adapt having their eyes and ears moved to their shoulder?